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This patch brings basic support for the Analog Devices ADT7410 temperature sensor. The following functionality has been implemented: * get current temperature * get/set minimum, maximum and critical temperature * get/set hysteresis * get alarm events for minimum, maximum and critical temperature All implemented sysfs attributes have been sucessfully tested at temperatures of 15°C to 40°C. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
52 lines
2.1 KiB
Plaintext
52 lines
2.1 KiB
Plaintext
Kernel driver adt7410
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=====================
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Supported chips:
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* Analog Devices ADT7410
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Prefix: 'adt7410'
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Addresses scanned: I2C 0x48 - 0x4B
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Datasheet: Publicly available at the Analog Devices website
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http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf
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Author: Hartmut Knaack <knaack.h@gmx.de>
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Description
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-----------
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The ADT7410 is a temperature sensor with rated temperature range of -55°C to
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+150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution
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of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to
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indicate that a minimum or maximum temperature set point has been exceeded, as
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well as a critical temperature (CT) pin to indicate that the critical
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temperature set point has been exceeded. Both pins can be set up with a common
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hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both
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pins can individually set to be active-low or active-high, while the whole
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device can either run in comparator mode or interrupt mode. The ADT7410
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supports continous temperature sampling, as well as sampling one temperature
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value per second or even justget one sample on demand for power saving.
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Besides, it can completely power down its ADC, if power management is
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required.
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Configuration Notes
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-------------------
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Since the device uses one hysteresis value, which is an offset to minimum,
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maximum and critical temperature, it can only be set for temp#_max_hyst.
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However, temp#_min_hyst and temp#_crit_hyst show their corresponding
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hysteresis.
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The device is set to 16 bit resolution and comparator mode.
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sysfs-Interface
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---------------
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temp#_input - temperature input
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temp#_min - temperature minimum setpoint
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temp#_max - temperature maximum setpoint
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temp#_crit - critical temperature setpoint
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temp#_min_hyst - hysteresis for temperature minimum (read-only)
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temp#_max_hyst - hysteresis for temperature maximum (read/write)
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temp#_crit_hyst - hysteresis for critical temperature (read-only)
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temp#_min_alarm - temperature minimum alarm flag
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temp#_max_alarm - temperature maximum alarm flag
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temp#_crit_alarm - critical temperature alarm flag
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